Malicious PDF — malware analysis report

Static analysis result for SHA-256 81328dff7f222b04…

MALICIOUS

PDF

106.5 KB Created: 2021-04-15 09:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2ceba70c861c2a9e9df87e3b5f54a778 SHA-1: d7ec7738f7495029978adf5cf9a50a13c8c40872 SHA-256: 81328dff7f222b043195e9b5bccf739e3f5d67e0a6b518e4e8a471e2113f75e0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The primary URL, 'https://midufefew.ru/strik?utm_term=professional+cooking+wayne+gisslen+6th+edition+pdf', suggests a lure related to a specific book title, likely to trick users into clicking. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://midufefew.ru/strik?utm_term=professional+cooking+wayne+gisslen+6th+edition+pdf PDF link annotation
    • http://bajifepeselok.sportsontheweb.net/62411794457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489237/normal_5fd12d6c7da21.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/asymmetric_information_in_financial_markets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415783/normal_60167e4890662.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/hetigw2/home_assistant_zigbee_usb.pdfIn PDF document text
    • https://cdn.sqhk.co/fewukise/jeggCia/carrom_disc_pool_online_game_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/sarafogu/g3oQpQQ/ninja_fighter_game_video.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388065/normal_602f51d17a5f1.pdfIn PDF document text
    • http://xulodol.mygamesonline.org/28859692786.pdfIn PDF document text
    • http://piriveva.scienceontheweb.net/2597604280.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/hcnu2v5/download_super_jabber_jump_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/hFiaiat/almost_a_hero_mod_apk_revdl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477173/normal_605a5e3cbf4d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/katz_index_of_independence_in_activities_of_daily_living.pdfIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_553e685b1b0c4a9ebcc5eb72bf3aebdd.pdf?index=trueIn PDF document text
    • http://nopugorib.onlinewebshop.net/blood_bowl_board_game_rules.pdfIn PDF document text
    • http://wipovevoliku.epizy.com/ginujudolija.pdfIn PDF document text
    • http://davejizejago.rf.gd/boom_beach_hack_unlimited_diamonds_apk.pdfIn PDF document text
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_f32e8398d81f4e2ea6bd2c6669cba81c.pdf?index=trueIn PDF document text
    • https://ed8bc375-cd54-49ab-9ddb-988cb5b2fc3d.filesusr.com/ugd/3f3824_5ffa6e6f723e42d2b823288a0f3f63d9.pdf?index=trueIn PDF document text
    • http://bopadem.rf.gd/inorganic_growth_strategy.pdfIn PDF document text
    • http://togaretib.epizy.com/soal_deret_aritmatika_dan_geometri.pdfIn PDF document text
    • http://loruluze.epizy.com/nfl_week_8_injury_report_update.pdfIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_60fef0d6171f46559df90e2ecd28d6e4.pdf?index=trueIn PDF document text
    • http://kutoxinupuroxo.onlinewebshop.net/credit_risk_management_tools.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F40 3124 bytes
SHA-256: d4382e54d95c95fbf83b3f2fe523f5aa579560ce7cb009d4e6a81648cf1177b1
font_01_sfnt_off00013a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7F 5832 bytes
SHA-256: 2182c4e11ca999e75bfd73f878468fd17043f194462c9eec9df70188c789dcaa
font_02_sfnt_off00014e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E6A 17424 bytes
SHA-256: 59fd6e616cf245a3916709bce4e07f168064f2c08899094708af450868044873
font_03_sfnt_off00018166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18166 17404 bytes
SHA-256: f844a84870bf45954fcd448d966082097a6ca01f3cd59e4c3f0a3f7377a3b280

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